Showing papers on "VLF cable testing published in 1997"
19 Oct 1997
TL;DR: In this paper, the defect detecting capability of two different way of the OW voltage test, such as with-cable-charging and without-cables-charging method, was investigated.
Abstract: In this study, experimental investigation has been carried out for the defect detecting capability of two different way of the OW (oscillating wave) voltage test, such as with-cable-charging and without-cable-charging method. For this purpose, two types of OW voltage tests have been performed at the laboratory on the 22.9 kV CN/CV cables in which artificial needle-type and knifecut-type defects were well integrated. Based on the test results, it could be remarked that the with-cable-charging method is more appropriate to the after laying test due to its consistency of the test condition regardless of the cable length under testing.
9 citations
25 May 1997
TL;DR: Based on the principle of two variable output high DC voltages, this paper introduced a new type of 0.1 THz very low frequency (VLF) sinusoidal wave high voltage generator.
Abstract: Based on the principle of two variable output high DC voltages, the paper introduces a new type of 0.1 THz very low frequency (VLF) sinusoidal wave high voltage generator. It has a 50 KV output voltage and capable of loading a 2 /spl mu/f of capacitance. It can be used as an on-site AC voltage source in the AC voltage and partial discharge tests for XLPE power cables.
7 citations
1 Jan 1997
TL;DR: In this article, the authors present the existing medium voltage cable grid in the Netherlands and show that the XLPE cable is responsible for the very short outage times in our country and that the future development of cable systems will be in two ways: firstly by diagnostics like 0.1 Hz partial discharge measurements; and secondly by monitoring and by protection with integrated fibre optics in all types of power cables.
Abstract: In this paper the existing medium voltage cable grid in the Netherlands is shown. The perfect performance of these cables is responsible for the very short outage times in our country. Typical is the belted paper 12 kV cable with a very good performance since 1905. However, problems with this type of cable have occurred more frequently. With the arrival of the newly developed 12 kV three phase XLPE cable we can solve the paper cable problems. The main solution is using the XLPE cable for high and strongly changing loads. For the normal thin distribution cables the existing paper cable can be used for more than 40 years. The future development of cable systems will be in two ways: firstly by diagnostics like 0.1 Hz partial discharge measurements; and secondly by monitoring and by protection with integrated fibre optics in all types of power cables. With these developments we will come to 'total cable management'.
3 citations